Negotiating salary and benefits in Turkey

I'll start by saying, it varies. For most expat packages, your term sheet/employment contract is provided to you and negotiated every year. Yo can certainly negotiate and haggle with your respective employer on the offer, but be aware of the next candidate down the line. Ask too much and you may not be viable any more.

Healthcare is a must and is usually provided in your package, after that, the emoluments will vary from company to company. Smaller companies hardly offer anything more than a car (if it came to that for a senior managerial position or higher), else you don't get much. Just note, that healthcare, especially for expats is more expensive.

Also, if you have children, make sure their tuition fees is included. Foreign students have to enroll in international schools which are prohibitively expensive for many.

Yes you have to pay taxes on your salary. It used to be that salaries were negotiated in US Dollars or Euros. Not any more. There was a law passed and most contracts are now in Turkish Lira, so anytime the Lira weakens, you get impacted (if the mental calculation in your mind is always on how many Dollars you are earning).

If you spend more than 183 days here in Turkey, you're considered a local resident here (as per the tax rules), so your income is taxed as per Turkish Tax Laws. You can show this to the tax authorities at the country of origination and I doubt you would have to pay tax there, as you're not a tax resident any more (that has moved to Turkey when you work here).